Plug electric switch



March 30, 1937.

M. ZUCKERMAN 2,075,632

`PLUG ELECTRIC SWITCH Filed Nov. 26, 1935 2 Qt in! /U ATTORNEY;

Patented Mar. 30, 1937 .PATENT ori-ICE PLUG ELECTRIC SWITCH MiltonZuckerman, New York, N. Y., -assignor to Irving' Haas, New York, N. Y.

Application November 26, 1935, Serial No. 51,666

2 Claims.

'Ihis invention relates to electric switches and particularly to animproved plug electric switch, and has for an object to provide astructure which may be quickly applied and removed and when applied maybe locked in position.

Another object of the invention is to provide a plug for electric sadirons and for other devices using cylindrical terminals,the structurebeing such that the plug may be applied from either' oftwo 'directionsand then locked in place. A furtherobject, more specifically, is toprovide a plug switch structure for round terminals wherein the contactsengaging the terminals are moved toward and from the terminal so that atone time they will grip `the terminals and at another time they willrelease the terminals.

In the accompanying drawing:

Fig. 1 is a plan view of a plug switch disclosing an embodiment of theinvention;

Fig; 2 is a longitudinal sectional view. through Fig.3 approximately onthe line 22;

Fig. 3 is a sectional View through Fig. l approximately on the line3-v3;

Fig. 4' is a. transverse sectional view on an enlarged scale throughFig. 1 approximately on the line 4 4; and- Fig. 5 is-a'n enlarged viewsimilar to the left hand end of Fig. 2 but showing the plug applied from`the end. e

Referring to the accompanying drawing by numeral, I indicates the plugas a whole andl though this is not essential to a lgood contact.-l

Thesegroov'es areprovided so that they plug I may be locked to theterminals 2 andA 3. The

40` plug I is provided with a casing having a body 6v and a cover 1which,may be held in place' in any desired manner, as'- for instance bythe bolt 8. This casing is made from insulating material and enclosesthe respective gripping 'terminals 9 and I0. .As these terminals areidentical the same description will apply to both.

As shown in Fig. 2, terminal 9 is formed from a piece of wire or othermetal having a loop II for accommodating the bolt I2 which connects thewire-I3 to the terminal or contact 9. From the loop II the wire isformed into bars I4 and I5 which diverge to points vI6L and I1. Frompoints I6 and I1 -to the points I8 and I9 the bars converge and thenmerge into a rounded socketstructure 20. The Wire is bent upwardly atright angles at the outer end of the socket structure and is then bentinto a second socket structure 2|. The socket structure 20 is adapted togrip the posts or terminals 2 and 3 when the plug is applied as shown inFig. 4, while the socket 2| grips the terminals when the plug is appliedvfrom the end asshown' in Fig. 5.

When the parts are in the position shown in Fig. 2, the plugmay beslipped over the terminals 2 and 3 readily and then the thumb or handmember 22 is moved to theri'ght from the position shown in Fig. 3. Thisthumb or hand member is connected bya'bolt 23 to a cam bar 24. Guidepins 25 and 26 are carried by the cam bar and extend into the respectiveslots 21 and 28. For each of the terminals or contacts the cam bar 24 ispr vided with cam surfaces 29 and 30, whereby ast e bar 24 is moved tothe right as shown in Fig. 3 the camsurfacesjust men-l tioned will acton the inclined partscf the terminal and cause the socket 20 to squeezethe terminal posts 2 and 3. This squeezing action takes place in therespective grooves 4. In this way a good electrical contact is vsecuredand also the plug I is locked tothe terminal posts 2 and. 3. When theplug I is applied from the end as shown in Fig. 5, the same action takesplace, except that the sockets 2| engagethe posts 2 and 3 in therespective grooves 5. By.y reason of the construction just described theplug may be easily applied. and easily removed, but when appliedpresents a locked construction and agood contact between the respectiveterminals.v

I claim:

1. A plug electric switch including a plug formed `with a casing havinga pair of openings in one side and a pair of openings in one end, saidopenings being adapted to receive plug terminals at diierent times, aipair of terminals arranged in saidl casing, eachof said terminals beingformed with a pair of resilient'bars merg ing into an inner structurepresenting apair of socket formations, said inner structure including apair of barsinclined toward each other and at their point of nearestapproach merging into a pair of facing arc-shaped socket ends, onesocket formation normally positioned on e "h ,side of the aperture inthe side of the casing.`

2. A plug for an electric switch comprising a hollow rectangular casinghaving a pair of openings in one side near one end for-the reception ofa pair of plug terminals, anda pair of openings in one end spaced thesame distance apart as the :first mentioned openings, a pair ofterminals arranged -in said casing, the terminals be- A ing arrangedwith one end adjacent the respec-l tive openings in the casing, each ofsaid termi- 10 nals comprising a pair of bars extending longitudinallyof the casing having a tapering structure merging into arc-shaped endshaving varc-

